Abstract
The observed suppression of particle production at high transverse momentum in nucleus-nucleus collisions at high energies is an effect of the energy loss of partons as they propagate through the hot and dense deconfined QCD medium. The measurement of transverse momentum spectra of primary charged particles in Pb–Pb collisions and the comparison to the measurement in pp collisions are important to study the properties of the deconfined medium. In 2015, pp and Pb–Pb collisions have been recorded at the LHC at the energy of = 5.02 TeV. The inclusive charged particle production is measured with the ALICE detector in the pseudo-rapidity range |η| < 0.8 and in the transverse momentum range 0.15 < pT < 40 GeV/c. The spectra in Pb–Pb, determined for several centrality intervals, are compared to the reference spectrum in pp collisions by calculating the nuclear modification factor RAA. The data are compared to measurements at the lower collision energy of 2.76 TeV and to model predictions.
Highlights
The charged particle production has been measured in different collisions systems and at several beam energies
Bjorken had earlier introduced the idea that such an observation is related to parton energy loss in the hot and dense QCD medium created in the collision of heavy ions [3], which leads to a modification of transverse momentum distributions of the final particles
The ALICE experiment has o√bserved a stronger suppression of hadron production at high-pT in central Pb– Pb collisions at sNN = 2.76 TeV [4], indicating the creation of a denser and hotter medium comparing to RHIC energies
Summary
The charged particle production has been measured in different collisions systems and at several beam energies. Experiments at RHIC have found, f√rom the measurements of the transverse momentum spectra in p+p and Au+Au collisions at sNN = 130 GeV [1, 2], that the high-pT particle production in heavy-ion collisions is suppressed compared to the production measured in pp. The ALICE experiment has o√bserved a stronger suppression of hadron production at high-pT in central Pb– Pb collisions at sNN = 2.76 TeV [4], indicating the creation of a denser and hotter medium comparing to RHIC energies. This modification is typically quantified in terms of the nuclear modification factor: RAA =.
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